NT WorkSafe is investigating an incident in which a 31-year-old electrician suffered serious crush injuries after he was pinned by an electrical switchboard weighing approximately 1.5 tonnes.
The incident happened on Wednesday morning.
The NT safety regulator said the injured worker and two other workers were moving the electrical switchboard into position for installation at the Palmerston Police Station when the incident happened.
A non-disturbance notice has been issued preventing access to the switchboard room while the investigation continues.
The man was rushed to the Royal Darwin Hospital, where he remains in a critical condition.